Sensitivity of mobile devices to doppler shifts and poor synchronization between UMTS transmitters
Tutor / Supervisor
Fledderus, Erik
Student
Belmonte Batlle, Ricardo
Document type
Master thesis (pre-Bologna period)
Date
2010
rights
Open Access
Publisher
Universitat Politècnica de Catalunya
UPCommons
Abstract
UMTS network, also known as Third Generation (3G) mobile radio system, aims to
provide services such as: mobile communication, data streaming, internet and
driving guidance. The UMTS signal uses the frequency channel of 2GHz. This
channel introduces some propagation difficulties like multipath effect, Doppler shifts
and fading. UMTS improves the well known hard-handover process from 2G
networks into the soft-handover. During the soft-handover, the mobile station is
connected to different transmitters at the same time. The bad frequency
synchronization of these transmitters creates the same propagation difficulties.
These bad effects aforementioned can affect the quality of the communication
between the Base Station and the mobile device. The thesis presents the study of
propagation effects on the received frequency and compares the results with the
synchronization requirements of the transmitters. BER simulations where done to
study the reception quality in high-speed conditions. Furthermore, we introduce a
method to reduce the impact of fast-device movement that can be used in the softhandover
procedure to reduce the effect of bad synchronization.
Entitat col·laboradora
Technische Universiteit Eindhoven
Participating teacher
- Fledderus, Erik